JEE Main Maths · Statistics
Combined Variance of Two Sets
Combined Variance of Two Sets (Statistics) was asked 4 times in 4 JEE Main shifts, 2021–2026, out of the 42 shifts Lumi analysed. 1 of the 4 had a numerical answer.
- Times asked
- 4
- in 4 shifts
- Years
- 2021–2026
- Usual format
- Single correct
- Calculation
- Pattern
- Frequent
- repeats across shifts
How it is asked
- Find unknown data from mean and variance
- Combined variance of two sets
Difficulty
Easy 2Medium 2Hard 0
Where it sits
Chapter: Statistics. Topic: Variance and SD, 27 questions over 10 ideas.
Other repeat ideas in this topic
Every time it came
All 4 questions
Newest first, each with its options and official answer.
- 8 Apr 2026, Shift 2 · Q7A set of four observations has mean 1 and variance 13. Another set of six observations has mean 2 and variance 1. Then, the variance of…EasySingle correct
- 6 Apr 2023, Shift 1 · Q17The mean and variance of a set of 15 numbers are 12 and 14 respectively. The mean and variance of another set of 15 numbers are 14 and…MediumSingle correct
- 11 Apr 2023, Shift 1 · Q18Let sets A and B have 5 elements each. Let the mean of the elements in sets A and B be 5 and 8 respectively and the variance of the…MediumSingle correct
- 16 Mar 2021, Shift 2 · Q86Consider the statistics of two sets of observations as follows : Size Mean Variance Observation I 10 2 2 Observation II n 3 1 If the…EasyNumerical value